If you want to work in Rákosmente, choose Rákosmente in the application before going online.
If you work without a scheduled hour and want to change the delivery area, all you have to do is switch yourself offline and select Rákosmente before going back online again.
Also, if you work in Rákosmente you must be within the zone shown in the image below. In this case, you only need to deliver orders from restaurants within the Rákosmente zone.
The hotspots are marked for you on the map below.
Rákosmente delivery area: